Induction loop paging system

1-32 — elektor january 1982 induction loop paging system Short range paging systems are normally used in large buildings or by people with very poor hearing. The system described in this article has many more applications: it can be used as a "wireless" connection for radio or TV sound, as a baby alarm, as a doorbell extension or even as an intercom system. 1 duced in a small pick-up coil (see figure 1). The lines of (magnetic) flux are perpen- dicular to the area produced and bordered by the paging system. Al- though this system can be used in all the above mentioned cases, an infra-red system is more commonly used. Com- pared with the induction loop paging system, an infra-red system has many more advantages if only a small area has to be covered, the main points being greater bandwidth and less chance of interference. An induction loop paging system provides wireless transmission of infor- mation and can be used as a personal paging system in factories, warehouses, etc. or as...